Effect of Reaction Temperature on the Production of Carbon Nanotubes

Abstract

A floating catalyst chemical vapor deposition (FC-CVD) method was designed and fabricated to produce high quality and quantity carbon nanotubes. The reaction temperature was optimized to produce high yield and purity of the carbon nanotubes. The reaction temperatures were varied from 500–850°C. The result shows that carbon nanotubes were observed from 600°C to 850°C with maximum numbers and high purity at 850°C. The diameter range of CNTs varied from 2 to 55 nm. The results of the present investigation suggest that the observed changes in catalytic activity and selectivity accompanying an increase in temperature are probably due to major alterations in the distribution of atoms at the metal/gas interface. Thermodynamically, higher temperatures favor the surface decomposition of hydrocarbon rather than the hydrogenation reactions.

Effect of Carboxylic Functional Group Functionalized on Carbon Nanotubes Surface on the Removal of Lead from Water

“…The experimental set-up used to synthesize the Multiwall Carbon Nanotubes is similar to that reported by Muataz et al [28, 29]. The Floating Catalyst Chemical Vapor Deposition (FC-CVD) reactor has been used to produce CNTs.…”

Activity and active sites of nitrogen-doped carbon nanotubes for oxygen reduction reaction

“…The temperature influence on the structure of the carbon materials has been emphasized. It is generally accepted that carbon materials are formed by carbon atom dissolving, diffusing, and precipitating through the catalyst droplets in CVD process [37,38]. Figure 10 shows the polarization curves of PEM fuel cells fabricated using the CNx nanotubes grown at 800 and 900°C as cathode catalysts.…”

Fluidized bed catalytic chemical vapor deposition synthesis of carbon nanotubes—A review

“…Muataz et al [68] studied the role of reaction temperature in CNTs synthesis by floating catalyst method, in which benzene and ferrocene were utilized as carbon precursor and catalyst, respectively. They pointed out that MWCNTs synthesis occurs at temperatures greater than 500 • C and maximum wall numbers with less impurity is obtained at 850 • C (see Fig.…”

“…Although in a few rare cases, CNTs were produced at temperatures higher than 1000 • C [67,72], but most reported that the CVD products are in non-tubular form of carbon at these temperatures [12,47,48,68]. It can be attributed to the fact that not only pyrolysis of carbon sources is generally promoted around 1000 • C, but also pyrolysis of the CNTs will begin.…”